Im looking to sell my 1988 Evinrude VRO 40 hp outboard motor, it sat for 3 years or so until i bought it 2 years ago, did some work to the motor and sounded great, idled nice in the driveway for quite sometime.... took it out on the water and fired right up, about 5-8 minutes in i had an annoying alarm ringing in my ear.... motor shut down and wouldn't start.... i've looked into it and hearing that its probably overheating, i was told to change out some gasket that allows the water to flow in.... guess they dry rot after time. could this be it or something else and what would something like this be worth as is?